[FFmpeg-trac] #7965(avcodec:open): Support for HEVC with Alpha

[FFmpeg]

#7965: Support for HEVC with Alpha
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             Reporter:  leemartin    |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  hevc         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by James):

 The file seems to have all the required parameter sets and alpha layer
 slices, so the only thing it's missing is the hvc1 tag. Use {{{-tag:v
 hvc1}}} for the output.

 You can also remove the custom alpha=1 x265-param as the library will
 detect the pixel format you're passing to it has an alpha plane.
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Ticket URL: <https://trac.ffmpeg.org/ticket/7965#comment:19>
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